JPH0370893A - Rotary compressor - Google Patents

Abstract

PURPOSE:To insure a sufficient oil level and prevent poor lubrication for sliding parts by arranging a feed oil quantity control device which is connected to the lower end of a coil spring made of shape-memory alloy and constituted out of a plug having a smaller diameter hole than a vertical feed oil hole, below a rotating shaft. CONSTITUTION:At starting in the case of low temperature of lubricating oil such as start from sleep, lubricating oil fed through the vertical feed oil hole 11 provided in a rotating shaft 3, is restricted with the hole 16a of a plug 16 to decrease sucking up quantity of lubricating oil, due to coil closing of a spring 17 made of shape-memory alloy. Hereby, as the lubricating oil is not taken out more than needs not to decrease lubricating oil quantity, the level of lubricating oil in a closed vessel 1 is stable, and reliability of the sliding parts of a compressor is improved.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a rotary compressor, and more particularly to a rotary compressor having an oil supply amount control device suitable for preventing lubricating oil from being taken out during startup and stabilizing the level of lubricating oil in a closed container. It is.

[Conventional technology]

FIG. 4 is a longitudinal sectional view showing a conventional rotary pressure WI machine described in, for example, Japanese Unexamined Patent Publication No. 63-230973. In FIG. 4, I+, lt is a closed container, and lubricating oil 2 is stored at the bottom of the closed container 1. 3 is a rotating shaft, and the rotating shaft 3 is driven by an electric element 4. 5 (the upper bearing, 6 is the lower bearing, these bearings 5
, 6 rotatably support the rotating shaft 3. Compression element 7
is a cylinder 8 whose upper and lower surfaces are closed by upper and lower bearings 5 and 6.
Inside the piston 9, the piston 9 is fitted on the eccentric part of the rotating shaft 3 and rotates eccentrically; the ben 10 is in constant contact with the piston 9 and is supported by the cylinder 8 to move back and forth; and the discharge valve. (not shown) as the main members. Reference numeral 11 denotes a vertical oil supply hole that is provided along the axis of the rotating shaft 3 and opens at the lower end surface thereof, and 12 and 13 communicate with the vertical oil supply hole 11 and are opposed to the upper bearing 5 and the lower bearing 6. This is a horizontal hole that opens on the outer peripheral surface of the rotating shaft 3. 14 is provided at the top of the oil supply vertical hole 11 and connects the oil supply vertical hole 11 and the closed container 1.
This is a gas vent hole that communicates with the internal space. 15 is an airtight container! ? This is a discharge pipe that is fixed to the top of the sealed container 1 and discharges discharged gas to equipment outside the closed container 1. Next, the operation will be explained. The rotary shaft 3 is rotated by the moving element 4, and the compression element 7 is operated to suck and compress the refrigerant gas, and then discharge it into the inside of the closed container 1. On the other hand, due to the rotation of the rotating shaft 3, the lubricating oil 2 stored at the bottom of the closed container 1 rises inside the oil supply vertical hole 11 by the action of a centrifugal pump, and passes through the horizontal holes 12 and 13 to the rotating shaft 3.
It is force-fed into the gap between the sliding part of the bearing 5.6 and the bearing 5.6. In addition, excess lubricating oil 2 other than that sucked from the lower part of the oil supply vertical hole 11 and supplied to each bearing 5 and 6 from the horizontal holes 12 and 13 is discharged from the gas vent hole 14 and flows to the bottom of the sealed official seal 1. return.

[Problems to be Solved by the Invention] Conventional rotary compressors are configured as described above, so when the rotary compressor is stopped for a long time, especially when the ambient temperature is low, the refrigerant does not dissolve in the lubricating oil and becomes stagnant. When the compressor is started in this state, lubricating oil containing refrigerant is sucked from the vertical oil supply hole, the lubricating oil is ejected from the gas vent hole, collides with the rotating part of the electric element, and the refrigerant gas in the lubricating oil is released. It foams and is distributed in the form of bubbles within the sealed container, and at the same time, the lubricating oil is also distributed in the form of fine particles. In this case, the lubricating oil is discharged from the discharge pipe together with the refrigerant gas to the outside of the compressor, the lubricating oil in the sealed container decreases, the oil level of the lubricating oil drops, and in extreme cases, the above curved surface becomes the rotating shaft. This causes a problem in that each sliding part lacks lubrication, causing a seizure accident. This invention was made in order to solve the above problems, and aims to provide a rotary compressor with high lubrication performance by reducing the amount of lubricant taken out from the compressor at the time of startup. The purpose is

[Means to solve the problem]

The rotary press machine according to the present invention has a coil spring made of a shape memory alloy material whose upper end communicates with a vertical oil supply hole provided in a rotating shaft, and which has a shape memory alloy material in which the coils are in close contact with each other at low temperatures and create a gap between the coils at a certain temperature or higher. and a stopper connected to the lower end of the spring and having a hole smaller in diameter than the vertical oil supply hole, is arranged below the rotating shaft.

[Effect]

In the rotary compressor according to the present invention, when starting when the lubricating oil temperature is low, such as during sleeping start-up, the coil of the spring made of the shape memory alloy material is in close contact with the rotary compressor, so that the lubricant is supplied to the vertical oil supply hole provided in the rotating shaft. The oil is squeezed out through the hole in the stopper,
Since the amount of lubricating oil sucked up is reduced, the lubricating oil is not taken out from the discharge pipe more than necessary, so the amount of lubricating oil does not decrease, and the level of lubricating oil in the sealed container is stabilized. This improves the reliability of the sliding parts of the compressor.

【Example】

Hereinafter, one embodiment of the invention of B is shown in Fig. 1, Fig. 2 (A), (
b) will be explained. In FIG. 1, numerals 1 to 15 indicate the same or equivalent parts as in FIG. 4, 16 is a plug provided with a hole 16a having a diameter smaller than the diameter of the oil supply vertical hole 11 in the center, 17 is a coil spring, The upper end of the coil spring 17 is fixed to the lower end of the lower bearing G and communicates with the lower end of the oil supply vertical hole 11, and the plug 16 is connected to the lower end, so that the coils of the spring 17 are in close contact at low temperatures. The spring 17 is made of a shape memory alloy material that has a characteristic that when the temperature exceeds a certain temperature, the spring 17 expands and creates a gap between the coils. 1
8 is a lubricant quantity pushing device consisting of the above-mentioned plug 16 and the above-mentioned spring 17. Note that the configuration and basic operation of this embodiment other than those described above are the same as those of the conventional rotary compressor shown in No. 3@. Next, the operation of the embodiment B will be explained. Figure 2 (A
) (B) is an enlarged view showing the operation of the oil supply amount control device part, and Fig. 2 (A) t shows the normal operation. During normal operation, the lubricating oil 2 is used as the discharge gas or the electric element 4. The temperature is rising due to heat generation in the compression element 7. Therefore, a gap is created between the coils of the spring 17, and the lubricating oil 2 stored at the bottom of the sealed container passes through the hole 16a of the cover 16 and the gap between the coils as shown by the arrow. The oil is sucked into the oil supply vertical hole 11 of the rotating shaft 3. FIG. 2(B) shows a case where the temperature of the lubricating oil 2 is low, that is, a long-term stoppage, etc. In this case, the coils of the spring 17 are in close contact with each other due to its temperature characteristics. When the compressor is started in this state, the lubricating oil 2 is sucked into the vertical oil supply hole 11 of the rotary shaft 3 only through the hole 168 of the shaft 16. When the temperature of the lubricating oil 2 rises due to operation of the compressor, the coils of the spring 17 are opened and normal oil supply begins. Therefore, when the compressor is started under conditions where the ambient temperature is low, the amount of lubricant oil 2 sucked up decreases, and therefore excess lubricant oil 2 is not discharged from the gas vent hole 14 and is discharged from the discharge pipe 15. Can you suppress the taking out of B lubricant 2? In addition, in this invention, when the compressor is started, especially when it is started at a low ambient temperature, the discharge pressure of the compressor is also low, and therefore the load on each sliding part is smaller than during normal operation, and the load on each sliding part is smaller than during normal operation. Even if the amount of refueling is less than the time, there is no effect on reliability. Furthermore, when the lubricating oil 2 is started at a high temperature, due to the characteristics of the refrigerant, the amount of refrigerant that dissolves into the lubricating oil 2 is small, so even if the lubricating oil 2 is started in this state, no foaming phenomenon will occur.
There's no need to take out oil. In the above embodiment, the spring 17 of the oil supply amount control device 18 consisting of the plug 16 and the spring 17 was fixed to the lower bearing 5, but in this invention, the spring 17 is fixed to the lower end of the rotating shaft 3 as shown in FIG. Even if it is fixed, the same effect can be obtained.

【Effect of the invention】

As explained above, the present invention is made of a shape memory alloy material whose upper end communicates with the oil supply vertical hole provided in the rotating shaft, and where the coils are in close contact with each other at low temperatures and create voids between the coils at temperatures above a certain temperature. A lubricant amount control device consisting of a coil spring and a plug connected to the lower end of the spring and having a hole smaller in diameter than the vertical lubricating hole is placed below the rotating shaft, so that the lubricating oil temperature can be controlled during sleep start-up, etc. By reducing the amount of lubricating oil carried out of the closed container from the discharge pipe when starting under conditions of low This has the effect of improving the reliability of the compressor.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a rotary compressor according to an embodiment of the present invention, and FIGS. 2(A) and (B) show the feed amount control device portion of FIG. 1 during normal operation and low temperature operation. Enlarged view of 3rd
This figure is a longitudinal sectional view showing a rotary compressor according to another embodiment of the present invention, and FIG. 4 is a longitudinal sectional view showing a conventional rotary compressor. 1 Sealed container, 2-Lubricating oil, 3 Rotating shaft, 4-Electric element, 5, 6 Upper and lower bearings, 7 Compression element, 11 - Vertical oil supply hole, 12, 13 - Horizontal hole, 16... Plug, 16a hole , 17 coil spring. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 21

Claims (1)

[Claims] An electric element located at the upper part and a compression element located at the lower part are disposed in the airtight container, and a vertical oil supply hole is formed in the axis of a rotating shaft that is driven by the electric element to operate the compression element, and the airtight container is sealed. In a rotary compressor that supplies lubricating oil stored at the bottom of the container to each sliding part from the oil supply vertical hole, the upper end communicates with the oil supply vertical hole, and at low temperatures, the coils come into close contact with each other, and at temperatures above a certain temperature, the coils close together. An oil supply amount control device is disposed below the rotating shaft, and includes a coil spring made of a shape memory alloy material with a gap therebetween, and a plug connected to the lower end of the spring and having a hole smaller in diameter than the vertical oil supply hole. A rotary compressor characterized by the following: